BenQ LH830ST 4000 Lumen Full HD Short Throw Laser Business ProjectorBenQ LH830ST 4000 Lumen Full HD Short Throw Laser Business Projector The BenQ LH830ST is a 4000 ANSI lumen Full HD 1080p laser projector built for boardrooms, classrooms, training rooms and golf simulator setups where space is tight. With a 0. 496 short throw ratio, a 3,000,000: 1 contrast ratio, a 20,000 hour laser light source and 16. 7 ms input lag, it produces large, bright, sharp images from just a short distance away. Bright, Sharp Full HD